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Rheological Characteristics for Thin Film Elastohydrodynamic Lubrication with Non-Newtonian Lubricants

Published online by Cambridge University Press:  05 May 2011

H.-M. Chu ,
Y.-P. Chang  and
W.-L. Li
H.-M. Chu*
Affiliation:
Department of Mechanical and Automation Engineering, I-Shou University, Kaohsiung County, Taiwan 84001, R.O.C.
Y.-P. Chang*
Affiliation:
Department of Mechanical Engineering, Kun Shan University, Tainan, Taiwan 71003, R.O.C.
W.-L. Li*
Affiliation:
Institute of Nanotechnology and Microsystems Engineering, National Cheng Kung University, Tainan, Taiwan 70101, R.O.C.
*
*Associate Professor
*Associate Professor
*Associate Professor
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Abstract

The modified Reynolds equation for power law fluid is derived from the viscous adsorption theory for thin film elastohydrodynamic lubrication (TFEHL). The differences between classical non-Newtonian EHL and non-Newtonian TFEHL are discussed. Results show that the proposed model can reasonably calculate the pressure distribution, the film thickness, the velocity distribution and the average viscosity under thin film lubrication. The thickness (δ), the viscosity (m1), and the flow index (n1) of the adsorption layer influence significantly the lubrication characteristics of the contact conjunction. Furthermore, the film thickness increases with the increase of n1 and the film thickness affected by m1 is greater than that affected by n1, but the effect of n1 produces a very small difference in the pressure distributions. In addition, the greater n1, the smaller the change of velocity distribution in the adsorption layer, and the greater the change of velocity distribution in the middle layer. The larger δ and n1, the larger the deviation on log (film thickness) vs. log (speed) produced in the very thin film regime. In the region of the flow index ratio between 1.0 and 1.3, the difference in film thickness is significant. When the flow index of the adsorption layer is 1.6 times greater than the flow index of the middle layer, the adsorption layer is generally looked upon as a “solid-like”.

Keywords

TFEHLAdsorption layerPower law lubricantsAverage viscosity
Type
Articles
Information
Journal of Mechanics , Volume 23 , Issue 4 , December 2007 , pp. 359 - 366
Copyright
Copyright © The Society of Theoretical and Applied Mechanics, R.O.C. 2007

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